Adapting the upgraded cppreference #51

The cppreference website has been upgraded at 17 April 2026, and a lot of changes happened that make this script fail.

1. Change in image hosting url
   Example page: https://en.cppreference.com/cpp/io, which references an image from https://upload.cppreference.com/mwiki/images/0/06/std-io-complete-inheritance.svg, which is 404 after the upgrade, and correct url is https://upload.cppreference.com/images/0/06/std-io-complete-inheritance.svg
   Affect: Preprocess script would fail to move files from upload.cppreference.com since it's not downloaded
2. Missing static resources
   Example page: https://en.cppreference.com/cpp/numeric/constants, where favicon, fonts, and images missing, for example https://en.cppreference.com/mwiki/skins/cppreference2/images/navbar-tab.png
   Affect: Preprocess script would fail to move favicon since it's not downloaded
3. Change in script/style loader layout
   Example page: https://en.cppreference.com/cpp/numeric/constants
   Affect: Preprocess script would fail to convert_loader_name with nonexistant script/styles
4. Use of external scripts
   Example page: https://en.cppreference.com
   Affect: External script not downloaded, for example https://cdn.jsdelivr.net/ace/1.2.4/noconflict/ace.js also there's a script from static.cloudflareinsights.com that should be excluded.

Not meant to push but to provide some info for future update of the scripts.